In this article, David Chandler challenges the often dismissive interpretation of Catherine Johnson’s hugely successful Mamma Mia! (1999) as a sunny, upbeat, lightweight musical. Johnson’s earlier dramatic work was of a more serious cast, and returned repeatedly to scenes of damaging, often exploitative, intergenerational desire. This interest continues in Mamma Mia! though commercial imperatives meant it had to be suppressed and displaced. As Sophie, the heroine, secretly meets the three middle-aged men who could be her father, but who have no idea she may be their daughter, the danger that they may be sexually attracted to her – one of them quickly labels her a ‘minx’ – becomes a subter ranean force shaping the fates of most of the central protagonists and the final surprise irresolution of the paternity plot. Intergenerational relationships blossom in Mamma Mia!, but they are treated differently from the relationships between couples of similar ages. David Chandler is a professor in the English Department at Doshisha Univ er sity, Kyoto. His background is in literary Romanticism, but since 2008 he has also pub lished widely on the history of musical theatre in Britain. He is a director of Retrospect Opera.